/*
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
    @WebServlet("/ajxa")
public class Ajxa extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    req.setCharacterEncoding("utf-8");
    resp.setContentType("text/html;charset=utf-8");

        String username = req.getParameter("username");

        if ("zhangsan".equals(username)){
            resp.getWriter().write("<font color='red'>用户名以被注册<font>");
        }else {
            resp.getWriter().write("<font color='green'>用户名可以使用<font>");
        }
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}
*/
